Heat Transfer Multiple Choice Questions and Answers

31. Metals are good conductors of heat because

1. their atoms collide frequently
2. their atoms-are relatively far apart
3. they contain free electrons
4. they have high density

32. Which of the following property of air does not increase with rise in temperature

1. thermal conductivity
2. thermal diffusivity
3. density
4. dynamic viscosity

33. Temperature of steam at around 540°C can be measured by

1. thermometer
2. radiatiouv pyrometer
3. thermistor
4. thermocouple

34. Heat transfer takes place as per

1. zeroth law of thermodynamics
2. first law of thermodynamic
3. second law of the thermodynamics
4. Kirchoffs law